Crystalline lens curvature and thickness obtained with a slit-scanning system: preliminary results

2021 ◽  
Author(s):  
Jessica Gomes ◽  
Sandra Franco
Keyword(s):  
Crystalline Lens ◽  
Scanning System ◽  
Preliminary Results ◽  
Slit Scanning

scholarly journals Crystalline lens imaging during accommodation with a slit-scanning tomography system: preliminary results

2020 ◽  
Vol 238 ◽  
pp. 12015
Author(s):  
Jessica Gomes ◽  
Sandra Franco
Keyword(s):  
Crystalline Lens ◽  
Experimental Results ◽  
Wavefront Aberrations ◽  
Preliminary Results ◽  
Ocular Accommodation ◽  
Tomography System ◽  
Slit Scanning

A slit-scanning tomography system previously developed in the Centre of Physics of University of Minho allows to capture images of the eye and posteriorly calculus of the biometric (thickness and curvature) and optical (wavefront aberrations) properties of the corneal and crystalline lens surfaces. It is intended to optimise the system for an accurate computing of these properties of the crystalline lens in the relaxed state and during ocular accommodation. In this study, preliminary experimental results of the crystalline lens imaging of a subject during accommodation are presented.

Preliminary results, obtained by using a proton beam, for an active scanning system to installed on the KHIMA

2015 ◽  
Vol 67 (3) ◽  
pp. 581-589 ◽  
Author(s):  
Chang Hyeuk Kim ◽  
Hwa-Ryun Lee ◽  
Sea Duk Jang ◽  
Hyunyong Kim ◽  
Garam Hahn ◽  
...  
Keyword(s):  
Proton Beam ◽  
Scanning System ◽  
Preliminary Results ◽  
Active Scanning

Preliminary results of a new method for measuring the spectral absorption of the crystalline lens in vivo

2018 ◽  
Vol 44 (4) ◽  
pp. 512-513
Author(s):  
Manuel Gonzalez-de-la-Rosa ◽  
Marta Gonzalez-Hernandez ◽  
Paloma Rodriguez-Esteve ◽  
Carmen Mendez-Hernandez
Keyword(s):  
Crystalline Lens ◽  
New Method ◽  
Spectral Absorption ◽  
Preliminary Results

Preliminary results from the new multiwavelength aerosol lidar scanning system in Turkey

2013 ◽  
Author(s):  
M. F. Huseyinoglu ◽  
Z. Salaeva ◽  
A. Secgin ◽  
K. R. Allakhverdiev
Keyword(s):  
Scanning System ◽  
Preliminary Results

scholarly journals Detection of Urinary Stones at Reduced Radiation Exposure: A Phantom Study Comparing Computed Radiography and a Low-Dose Digital Radiography Linear Slit Scanning System

2009 ◽  
Vol 192 (6) ◽  
pp. W271-W274 ◽  
Author(s):  
Zsolt Szucs-Farkas ◽  
Dev P. Chakraborty ◽  
Harriet C. Thoeny ◽  
Christos Loupatatzis ◽  
Peter Vock ◽  
...  
Keyword(s):  
Radiation Exposure ◽  
Digital Radiography ◽  
Low Dose ◽  
Computed Radiography ◽  
Phantom Study ◽  
Urinary Stones ◽  
Scanning System ◽  
Slit Scanning

scholarly journals Clinical boundary conditions for grating-based differential phase-contrast mammography

2014 ◽  
Vol 372 (2010) ◽  
pp. 20130033 ◽  
Author(s):  
Ewald Roessl ◽  
Heiner Daerr ◽  
Thomas Koehler ◽  
Gerhard Martens ◽  
Udo van Stevendaal
Keyword(s):  
Boundary Conditions ◽  
Phase Contrast ◽  
Clinical Aspects ◽  
Scanning System ◽  
Contrast Imaging ◽  
X Ray ◽  
Differential Phase ◽  
Advantages And Disadvantages ◽  
Differential Phase Contrast ◽  
Slit Scanning

Research in grating-based differential phase-contrast imaging (DPCI) has gained increasing momentum in the past couple of years. The first results on the potential clinical benefits of the technique for X-ray mammography are becoming available and indicate improvements in terms of general image quality, the delineation of lesions versus the background tissue and the visibility of microcalcifications. In this paper, we investigate some aspects related to the technical feasibility of DPCI for human X-ray mammography. After a short introduction to state-of-the-art full-field digital mammography in terms of technical aspects as well as clinical aspects, we put together boundary conditions for DPCI. We then discuss the implications for system design in a comparative manner for systems with two-dimensional detectors versus slit-scanning systems, stating advantages and disadvantages of the two designs. Finally, focusing on a slit-scanning system, we outline a possible concept for phase acquisition.

The O–C diagrams of minor planets − a new approach to modelling the rotation

1999 ◽  
Vol 173 ◽  
pp. 185-188
Author(s):  
Gy. Szabó ◽  
K. Sárneczky ◽  
L.L. Kiss
Keyword(s):  
Error Analysis ◽  
Time Dependence ◽  
Theoretical Work ◽  
Minor Planet ◽  
Minor Planets ◽  
New Approach ◽  
Preliminary Results ◽  
Ccd Observations

AbstractA widely used tool in studying quasi-monoperiodic processes is the O–C diagram. This paper deals with the application of this diagram in minor planet studies. The main difference between our approach and the classical O–C diagram is that we transform the epoch (=time) dependence into the geocentric longitude domain. We outline a rotation modelling using this modified O–C and illustrate the abilities with detailed error analysis. The primary assumption, that the monotonity and the shape of this diagram is (almost) independent of the geometry of the asteroids is discussed and tested. The monotonity enables an unambiguous distinction between the prograde and retrograde rotation, thus the four-fold (or in some cases the two-fold) ambiguities can be avoided. This turned out to be the main advantage of the O–C examination. As an extension to the theoretical work, we present some preliminary results on 1727 Mette based on new CCD observations.

Cyclic Evolution of Sunspots: Gleaning New Results from Old Data

2000 ◽  
Vol 179 ◽  
pp. 163-165
Author(s):  
S. K. Solanki ◽  
M. Fligge ◽  
P. Pulkkinen ◽  
P. Hoyng
Keyword(s):  
Sunspot Number ◽  
Sunspot Cycle ◽  
Preliminary Results ◽  
Butterfly Diagram

AbstractThe records of sunspot number, sunspot areas and sunspot locations gathered over the centuries by various observatories are reanalysed with the aim of finding as yet undiscovered connections between the different parameters of the sunspot cycle and the butterfly diagram. Preliminary results of such interrelationships are presented.

Systematic effects in observed parallaxes

1978 ◽  
Vol 48 ◽  
pp. 31-35
Author(s):  
R. B. Hanson
Keyword(s):  
Error Estimates ◽  
Zero Point ◽  
Absolute Zero ◽  
Apparent Magnitude ◽  
Coherent System ◽  
Preliminary Results ◽  
General Catalogue ◽  
Systematic Effects ◽  
New Evidence ◽  
Right Ascension

Several outstanding problems affecting the existing parallaxes should be resolved to form a coherent system for the new General Catalogue proposed by van Altena, as well as to improve luminosity calibrations and other parallax applications. Lutz has reviewed several of these problems, such as: (A) systematic differences between observatories, (B) external error estimates, (C) the absolute zero point, and (D) systematic observational effects (in right ascension, declination, apparent magnitude, etc.). Here we explore the use of cluster and spectroscopic parallaxes, and the distributions of observed parallaxes, to bring new evidence to bear on these classic problems. Several preliminary results have been obtained.

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